Abstract: A clutch friction disc has a hub and a support for friction linings which are mounted for limited relative angular movement. Two torsion damping devices control said angular movement, comprising a predamper and a stronger principal damper. The predamper comprises an annular plate equipped with displacement springs between two guiding washers and for axial connection between these washers there are provided elastic tongues originating from one of the plates and arranged to clip onto the other, these clipping tongues passing radially to the outside of the annular plate and alternating around the periphery with spacing lugs. These clipping tongues serve only for the preassembly of the predamper and subassembly in which there is also incorporated a spring for damping the oscillations of the predamper.

Abstract: A friction clutch wherein the diaphragm spring is tiltably installed between two seats one of which abuts against or is integral with the cover. The other seat is permanently urged against the diaphragm spring, so that the latter is permanently urged against the one seat, by axially stressed lugs which form integral parts of the cover and extend axially through apertures in the diaphragm spring to bear against the other seat or carry rivets with heads bearing against the other seat.